Drawing instrument



July l0, 1923. 1,461,421

G. J. .H OOD DRAWING INSTRUMENT Filed Jan. 39 V1919 INVENTOR unaran-sr Patented July l0,l l923.`

AGEORGE J. HOOD, OF LAV?RIEVLI'CIE,` KANSAS.

DRAWING- INSTRUMENT.

Appuoatiomea January sal-1919. serial No. 274,057. i,

To all whom-t may concern'.

Be it known th'atLlGnoRGn. J. Hoon, a. citizen of the United States of America, residing at Lawrence, in the county ofDoug-v las and State of Kansas, have invented a cer-` tain new and useful Drawing Instrument, of which the following, is a specication.

invention relates to` a drafting instrument and more particularly lto a combination drafting compass and vpen adapted to make circles inlead or in ink or tomake straight-line ink drawings. y f

ne object of my invention is to provide a compact,-simple, inexpensive and easily. manufactured` pocket y i, drafting instrument for use by amateur as. well as professional draftsmen, which will take the ,placeof an expensive and elaborate set of drafting instruments, each .of which vis specially adapted for a given purpose, and generally to provide a set ofinterchangeable parts whichhas a multiple of functions and uses dependof parts selected. c

A further, object of my. invention is to provide a compass 01E-variable radius which has Vno hinged jointsE capable yof wearing loose, which hasinterchangeable drawing pen and pencil parts adapted to beheld always ,in .parallel relation to a v fixed needle mg upon thecombination and arrangement which. defines the center lof a circle, which.

has a beam rigidly mounted on the needle and an extension armtherefor adapted either yfor drawing circles of verylarge radius or for use separately as a `drafting pen holder, and which. has a carrier for the markingv points, capable of being adjusted quickly and accurately in accordance with 'a' scale marked thereon to any given radius, andre'-v siliently held in any desired position withoutl the use of clamping screws which Vare liable to be stripped of, their threads. c l

With these andother objects in view, as will be apparent from the following disclosure, my invention resides inthe combination ings and set forth in the specification, and the scope thereof is determined from the nature of the claims 'appendedhere'te illustratedin the accompanying drawing, in which Figure l is a front `view and lFigure 2. is an end view of the instrument as assembled for drawing circles in pencil; Figure 3 is the front view, Figure 4 the top view, and Figure 5 the end view of avslide vtor cent one end of the of parts illustrated in the draw-V toning igure 8 is a front 9 an end Vview of a handle cfa pointedpostfV my invention illus- .they pen when drawingl circles-iii k; Figure 6 isaij'rontview and F igurev 7 a side view of the pen that is used for inkpen when drawing lines-inl as an extension beam; Figtrated in the drawings, the drafting set com- ,i

prises essentially a compass post lhavingl a beam 2* rigidly attached lower end and at right post l is provided at its-,lower end withla pointed needle 7 inserted therein as illustrated in Fig. 1, yor formedion the body kof the postl as shown at 28m. Fig.' l0. Thebeam 2 is p neierablyv locatedintermediate the ends of the post so that the upper portion,

of the post may be grasped by the fingers and rotated, and vfor may be knurled as illustrated.

In order `to support a `marking pencil rigto the postabove itsv anglessthereto.; .The

convenience in opera-J` tion of the instrument this headportion 25y idly and yetgadjustably on this beam ,2,L-

provide a carrier or slide 3 which is adapted l toresiliently clamp against saidbeam 4with I suliicient force to hold it lirmly in position and yetpermit oi-"ready adjustment when grasped by thel opera-tor. This slide is madeA of .considerable length as illustratedin Fig,

l, tol prevent undesired lateral movements; engage-y:

and to providegsuliicient frictional nient between it and thebeam. i I furthermore mount the. drawing `implement adjaslide to be mounted .with either/end adjacent the post so that either large or smallcircles may be drawn. vTo attainthis, interchangeability members adapted to engage the lsides ofthev metalstrip 2 and to clamp resiliently but firmly thereagainst, irrespective ofits position. 4 One simple construction forv partmember having gage one side of the beam'2' and resiliently slide and provide means Y on the beam. and slide whichpermit they and provide for a resilient `clamping engagement between the slide and of a strip of thinEi sides symmetrical,

c producing@ this clamping action is embodied-,ina twoj an 'arml adapted to enconnected to a secondrpOrtion.engagingthe oppositeside of the beam, As illustrated, a

` holds the nibs normally together.

' general ends 35 bent-slightly single, long, narrow strip of resilient metal is bent up in a U-sliaped form, and to prevent `lateral movement of the clamping slide on the beam, there is provided means such as a ribbed and grooved construction on the two parts which interfit and coact with each other. As shown in Figs. 1 and 2, .a groove 9 is formed in the beam 2, preferably on each side thereof, in order that the slide 3 may be reversible in position, and corresponding parts comprising ythe inwardly projecting ribs 410 are formed on the slide.

This cariier which travels lengthwise of the beam is adapted to hold a marking point in parallel relation with the post 1. Referring to Figs. 1 and 2, the pencil marker comprises a projecting arm 4 securely and rigidly/fixed to the lJ-shaped slide, which in the embodiment illustrated comprises a single strip of metal folded upon itself to engage opposite sides of the U-shaped'slide, and `to form a long slot of substantially circular cross section (see part 32) which is adapted to hold a cylindrically shaped piece oflead 5 slidably mounted therein. 1n order to permit insertion and adjustment of the lead, the two substantially flat portions 34 are slightly separated and at their lower outwardly to form wedge shaped portions so that they may be drawn together by means of a U-shaped clamp 6 slidably mounted thereover, as

` shown in Figs. 1 and 2.

The pen for inking circles and lines is shown in Figures 6 and 7. rlhe body nib 13 of the pen is formed with the shanks 14 at the upper end. The hinged nib 15 of the pen is pivoted on the pin 16. A spring 17 rlhe nib 15 may be swung away from nib 13 to permit of the pen being Vreadily cleaned. The adjusting screw 19 regulates the width of line drawn by the pen.

Slide S shown in Figures 3, 4, and 5 is of the same general cross-section as slide 3 and has grooves 12 to fit grooves 9 of beam 2. Slide 8 is formed with two .sockets 11 of a size to tit. shanks 14 of the pen. yAs illustrated, these sockets are located in projectingv parts made by folding over portions of the slide metal, lug 37 on one part being turned down over the other part to fasten the two halves together and strengthen the slide, The upwardly project-ing Shanks of the pen being made of resilient material and of the shape of the sockets in the pen slide, fit with a resilient and clamping engagement in these socktes and hold the pen rigidly in position.

In order to extend the beam 2 and permit making circles of extremely large radius, l may provide an extension arm 2O illustrated in Figs. 8 and 9, which is of the same cross section and shape as beam 2 and has two grooves 22 and 23 similar with the grooves in the beam and running `the full length of this-extension arm. By placing one of the slide members on beam 2 in such a position as to project over its end, the eX- tension arm may be inserted therein and it provided in turn with the other slide member and its associated drafting point.

The drafting pen as herein illustrated is not provided with a sufficiently long handle for use by itself, hence I propose to utilize the extension arm 20 for this purpose. To this end l provide another groove 27 in the arm adjacent one end and a clamping screw 21 having a head wide enough to extend over the groove 23 and the groove 27 opposite it. These grooves are made of such width as to permit the insertion of the projecting shanks 14 of the drafting pen therein. The drafting pen is clamped rigidly vin.

position by turning the screw 21 downuntil the head engages the sides of these shanks.

As illustrated in Fig. 1, the slot 4 ofthe pencil holder and the slots 11 of the pen holder may be so located relatively to the ends of the slides 3 and either slide or the mark registers with the desired mark of a scale 24 suitably located on the beam, then the distance between the needle point and the marking point will the same as the reading on the scale. Simiarranged and pro'- that whenk the slide is turned from the above disclosure. In order to make a pencil mark of a small radius, the carrierv 8 or other suitable index mark thereon that when the end off device is vobvious illustratedin Fig. 1 islocated on the beam? with the pencil point on the end ynearest thcy needle point 7. The clamp 6 is raised anda lead inserted in the groove in the U-shaped member formedr by parts 4 and 34 and th'e clamp G is then' drawn downwardly to hold the pencil point in place. ln order to nialr a circle of a radius substantially that of beam 2,v theslide is 're-r An ink mark may 'b ej the length of the versed end for endg made by positioning larly on the beam.

the pen carrier simi-` Circles of a very large radius and straight line ink markings may also be made by utilizing the extension arm' Y or handle 20 as above described.

By means of this construction.r .lprovide' a drafting instrument of separate parts' which are usable together and interchangeably for making large range of radii and for line drawings of any desiredcuives, these parts not being` complete purposes separate instruments forl different but constituting necessary mein` bers of a single compact unit, whereby' the. and varied ysetj;

necessity for carrying a large of drawing pens and pencils is entirely Vobviated.

pencil or ink circlesofay Having thus described my invention, what I claim.A as' new .and desire to securey by Let-- ters Patentisz- Y i n j 1. A draftingcoinpass.comprising a post having a pointed end and a4 body portionI adapted to bev grasped lby thehand for rotating the saine, a beam attached medially to said postat right angles tended slide resiliently clamping against the sides of said beam, but freely slidable andl laterally immovable thereon, and a'marking instrument onsaid slide.

2. A drafting compass comprising apointed post havinga hand hold at the end opposite the point, a beam having a scale thereon rigidly attached to a medial portion of the post, a reversible slide, having a scalerline,

, which is resiliently and vmovably mounted on the beam, said slide and beam having cooperating members permitting the slide to be mounted on the beam with either end adjacent the post and yet preventing lateral movement thereof, and a marking implement adjustably mounted on the-slide beneath the beam. j v y j.

3. A drafting compass comprising a post having a pointed end and a body portion grasped by the band for roadapted to be tating the same, a beam rigidly attached to said post at right angles thereto,a slide resiliently clamping against said beam, and having a member provided with a slot,y a

- marking implement adapted to be removably mounted in said slot andl means to holdsaid implement frictionally in position.

4. A drafting compass comprising a pointed'post, a beam rigidly attached at rightl angles thereto, a slide resiliently clamped thereon, means, comprising an in terftting rib and groove on the slide and beam, to permit longitudinal and prevent lateral movement of the slide and a drawinging the same, a beam rigidly attached at right angles to said post,a U-shaped slide comprising twoextended larms resiliently engaging opposite sides of said beam which permit free longitudinal movement of the slide, a marking instrument and means on the slide to hold said instrument adjustably thereon.

7. A drafting compass Vcomprisiifig a.

pointed post, a beam rigidly fastened at right angles thereto, an adjustable slide havthereto, lan excross section` gainst said beam and having a` coacting with thel post having a body portion adapted to be grasped by the hand for rotat- 'tering post, a beam slide resiliently engaging the beam, an implement .holding member attached to the..

ing. twofextendedarms. one resilientlv eno-a0.- b .u v., C 0 ing a large portioncf onesideof said beam.

and the other similarlyengaging theopposite:

side, an interlitting rib and groove construe-1 l i tion on saidbeamandfslide to -prevent-lat-f eral movementsof the slidefaA ,drawing imple-ment and yielding 'means' 'to hold the im-"j r plemeniiin adjustable position'on said slide.

8. A ldrawing compass] v, pointed postfandy 1av beam rigidly attached substantially at right,anglesatheretd an .eX-

comprising.- ya 'Y Y' t tension; arm vfashionedlconjunctively with:

the beam for longitudinal alignment therewith, means for securing said arm 'and beam in alignment to lengthen theefi'ective-radius A of. the-compass, and a drawing mounted ,o

n said extended beam, drafting #compass instrument, an extension cross' section as vthe beam, silient .members clamped said beam and arm va slide adjustably on said arm, and mountedthereon. v

10. A drafting compassv comprising a` pointed post, a 'beam rigidly fastened at right angles thereto for carrying a drawing instrument, an extension beam of similar right angles thereto fory carrying a drawing a slide having refashioned for silient clamp lfor securingsaid beams together, a slide fashioned for coactive funcfor resiliently engaging` in a manner to permit" ment thereon j and' a mounted on said slide. l1. -A drafting' said vbeamsbeing,` relatively` longitudinal alignment, a recompass comprising a v comprising i pointed post, 1a beam rigidlyk yfastened atv over the ends of to fasten 'themtogethen f andI resilientlyy clamped a marking instrumenty pointed post, a beam lrigidly fastened there- I to, a slide adjustably mounted and` having twoslots thereinv and a drawin implement hav-ing projecting arms"slidably` and resiliently held in saidslots.

12. A drafting instrument'v comprising va pointed post having a beam` rigidly attached at rightangles thereto, a

tened to said beam either the extension arm or the main beam, and a drawing point Acarried by said second slide.

V-shaped y slideresiliently and movably engagingl said beam, an extension arm adaptedto be fasby said slide, a second V-shaped slide adaptedto be mountedon'4 13. A drafting compass, comprising afcen`-` attachedto the post, a

slide which members, a applied to said clamping closure upon 4 said implement.

14. In a drafting compass,

is fashioned y to provide clamping a centering marking implement, and means members tol effect instrument l, i arm'of the Vsame tioningwith said beams,whens`o'joined, and j i the lextended beam longitudinal adjustdrawing implement.A

post, a beanmattached rigidly to said post, an implement support applied to the beam which is fashioned to provide resiliently active tension members adapted to permit the` i centering post, a rigid beam extending laterally therefrom, a tool supporting member Whicliis ashioned conjunctively with the beam to facilitatev longitudinal alignment tl-ierefwit'hfto/extend the effective" radius or"vv the'compase; adjustable' means tofasten' said In Witnessf whereofy l# aHiX-my signature k this QTtl-'ilfday of 5J amiary1 1919,' in the presence of two Witnesses. Y

GEORGEJ. HOOD.- VVitnesses GEO. @.SHAAm Y MADELINE OxRTER.

Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,461,421, granted July 10, 1923, upon the application of George J. Hood, of Lawrence, Kansas, for an improvement in Drawing Instruments, errors appear ini the printed specification requiring correction as follows: Page 1, after line 64 insert the paragraph Smlmmmterals refe7l to similmparts through-out the several views.; page 2, line 58, for the misspelled word socktes read sockets; page 3, lines 114 and 118, claim 12, for V-shaped read U-shaped; and that. the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Oflice.

Signed and sealed this 14th day of August, A. D., 1923.

[SEAL] KARL FEN N ING,

p Acting @ammissione/l' of Patents. 

